I've been using 700x25 gatorskins for about a year now at 115-120psi and only had one flat from a gnarly goat-head. I found out just how good these tires are when I went further east than I had before on a particular bike path and didn't know it ended at some train tracks in the toxic waste part of town. I rode through the loose gravel, broken glass and sharp rocks for a mile like a mtb at full-speed and had no problems whatsoever, and that was on year old tires.